Help fixing a malfunctioning GUI code.

[befigard]

My GUI code is here, it works as planned for the most part. However, when the user enters an invalid integer and the GUI throws the error message, I need the GUI to pull the message back up where the user is to re-enter the corrected integer. I am NEW to java, and very stuck on this. Can someone please help me.

import java.util.Scanner;
import javax.swing.JOptionPane;
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

            WeightCalculator wc = new WeightCalculator();
            boolean validData = false;
            double weight = 0;
            String strWeight = "";
            String strDescription = "";
            Scanner s = new Scanner(System.in);

            do {
                strDescription = JOptionPane.showInputDialog("Enter description of the object ");//input from user
                strWeight = JOptionPane.showInputDialog("Enter weight of the object ");//input from user


                weight = Double.parseDouble(strWeight);

                while (weight < 0 == weight < 99999) {//sets the parimeters for the error message
                    validData = true;


                    JOptionPane.showMessageDialog(null, "Please enter valid value for weight. It should be between 0 and 99999","Inane Error", JOptionPane.ERROR_MESSAGE);//output to user, error message     
                    validData = false;

                               

                }

            } while (validData = false);

            wc.setWeight(weight);
            wc.setDescription(strDescription);

            wc.setWeight(weight);
            wc.setDescription(strDescription);

            JOptionPane.showMessageDialog(null, "The weight of on Mercury is: " + wc.mercuryWeight(), "Result ", JOptionPane.PLAIN_MESSAGE);
            JOptionPane.showMessageDialog(null, "The weight of on Earth is: " + wc.earthWeight(), "Result ", JOptionPane.PLAIN_MESSAGE);
            JOptionPane.showMessageDialog(null, "The weight of on the Moon is: " + wc.moonWeight(), "Result ", JOptionPane.PLAIN_MESSAGE);
            JOptionPane.showMessageDialog(null, "The weight of  on Jupiter is: " + wc.jupiterWeight(), "Result ", JOptionPane.PLAIN_MESSAGE);



        }
    }


/** 
 * 
 * @author Bert 
 */
class WeightCalculator {

    private double weight = 0.0;
    private String description = null;

    public double earthWeight() {
        return weight;
    }

    public double mercuryWeight() {
        return weight * .378;
    }

    public double moonWeight() {
        return weight * .166;
    }

    public double jupiterWeight() {
        return weight * 2.364;
    }

    public String getDescription() {
        return description;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

[doWhile]

However, when the user enters an invalid integer and the GUI throws the error message

What error message? You need to post if you don't want us to guess. My guess: its a NumberFormatException - use a try/catch and deal with the exception accordingly
Lesson: Exceptions (The Java™ Tutorials > Essential Classes)